晶体多孔支架的强度与渗透性仿真分析

目的 分析对比钛合金晶体多孔支架和三周期极小曲面(triply periodic minimal surface, TPMS)多孔支架的强度,探索孔隙率对等效弹性模量和渗透性的影响。方法 构建相同孔隙率的晶体多孔支架(cell 1～4)和TPMS多孔支架(P、G、D和FKS型),利用有限元仿真方法,计算支架的等效弹性模量、等效屈服强度和渗透率。结果 8种支架的弹性模量为5.1～10.4 GPa,屈服强度为69～110 MPa, 4种晶体支架的渗透率为0.015～0.030 mm²。结论 随着孔隙率的增加,支架的弹性模量和屈服强度逐渐降低,渗透率逐渐升高;cell 2型支架因其较高的弹性模量和屈服强度,适合用于承重骨部位缺损的修复;cell 3型支架应力分布均匀,且线弹性阶段较长,可能适用于膝关节假体的多孔胫骨平台设计。

Simulation Analysis of Strength and Permeability of Crystalline Porous Scaffolds

Objective To analyze and compare the strength of titanium alloy crystalline porous scaffolds and porous scaffolds with a triply periodic minimal surface (TPMS) structure and explore the effect of porosity on the equivalent elastic modulus and permeability. Methods Crystalline porous scaffolds (cell 1-4) and TPMS porous scaffolds (P-, G-, D-, and FKS-type) with The same porosity were constructed, and the equivalent elastic modulus, equivalent yield strength, and permeability of the scaffolds were calculated using finite element simulation. Results The elastic modulus of eight scaffolds was in the range of 5.1－10.4 GPa, the yield strength was in the range of 69－110 MPa, and the permeability of 4 crystalline scaffolds was in the range of 0.015－0.030 mm2. Conclusions With an increase in porosity, the elastic modulus and yield strength of the scaffold gradually decreased, and the permeability gradually increased. The cell 2-type scaffold is suitable for repairing defects at load-bearing bone sites because of its high elastic modulus and yield strength. The cell 3-type scaffold with a uniform stress distribution and a longer linear elasticity phase may be suitable for designing porous tibial platforms for knee joint prostheses.